Acetabular morphometry and prevalence of hip dysplasia in the South Asian population

We carried out a cross-sectional study to measure the association of the seven acetabular parameters with pelvic morphometry and prevalence of hip dysplasia in our population. Convenience sampling was carried out and 250 consecutive patients who came to AKUH for intravenous pyelogram and had no complaints in the region of the hip joint were enrolled in the study. Post-micturition standardized plain antero-posterior pelvic radiographs of 250 asymptomatic adults (500 hip joints) was studied. There were 136 males (54.4%) and 114 females (45.6%). Mean age of our study population was 38 years (15-78 years). The average center edge angle was 35.5 +/- 6.6 degrees standard deviation (SD), acetabular angle was 37.76 +/- 4.37 degrees, depth to width ratio was 0.31 +/- 4.6 degrees, roof obliquity was 10.6 +/- 6.2 degrees, extrusion index was 0.1 +/- 5.8, lateral subluxation 8.9 +/- 2.7 mm, and peak to edge distance 17 +/- 3.98 mm. There was significant influence (p<0.05) of age in all angles except depth to width ratio. A total of seven hip joints (1.4%) were dysplastic with CE angle < 25 degrees while four of the seven hips were severely dysplastic with CE angle <20 degrees. In the dysplastic group there was significant correlation (p<0.05) of CE angle with acetabular angle, depth to width ratio, extrusion index and peak to edge distance. Prevalence of hip dysplasia was found to be very low in our population. These results are consistent with the findings of studies carried out in other Asian countries.